Messages in this thread | | | Date | Sun, 21 Mar 2004 20:49:31 +0000 | From | Christoph Hellwig <> | Subject | Re: can device drivers return non-ram via vm_ops->nopage? |
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On Sun, Mar 21, 2004 at 08:45:14PM +0000, David Woodhouse wrote: > There are machines where DMA to/from main memory _cannot_ be coherent > but we have some memory elsewhere, perhaps some SRAM which itself is > hanging off an I/O bus somewhere, which can be used. One of my toys is > currently running with dma_alloc_coherent() giving out memory from a PCI > video card, in fact. > > Using a PFN should be OK.
And what exactly is a PFN without associated struct page supposed to mean?
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